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Bersih, which means "clean" in Malay, is a global civil society movement that had held rallies, including in Auckland, calling for institutional reforms to prevent prime ministerial corruption.

"Using the passport as a threat is a desperate last gasp attempt from the Malaysian authorities to silence us," said the organiser, who spoke on the condition of anonymity.

"It may change what comes out of our mouths, but not what is in our hearts."

Last year, the rally was organised in several cities around the world, including in New Zealand, amid allegations in the Wall Street Journal that US$700 million ($1.04 billion) in state funds was deposited into Mr Najib's personal bank accounts and alleged mismanagement of state investor 1Malaysia Development Berhad (1MDB).

The Prime Minister was cleared of criminal offences and corruption this year after Malaysia's attorney general said the money was a gift from the royal family in Saudi Arabia.

Supporters of the Prime Minister started an online campaign in March, using Twitter hashtag #RespectMyPM to show their support.

Opponents have used it to continue their criticism, with former Malaysian Prime Minister Mahatir Mohamad tweeting: "Respect is earned. Not paid, not forced and definitely not from a hastag (sic) such #RespectMyPM. Should not it be more like #InspectMyPM?"

Malaysians in Malaysia also faced the three-year ban from travelling if they disparage or denigrate the Government.